The smallest visible area for computer graphics is a pixel and it can have only one color. Depending on the display device, a pixel may be limited to black/white, shades of gray, or a range of colors. In terms of coordinates, a pixel can be identified by a pair of integers giving the column number and the row number as (X, Y). Conventionally, columns are numbered from left to right, starting with zero. Some graphics systems number rows from top to bottom and some number from bottom to top. We will show examples of each.
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